Not that it matters an incredible amount or that you can fix it now, but I highly doubt that you own rails.com . Your package name is meant to be a unique domain that you own.
You don't need to "own the domain", strictly speaking, you need to use a unique package identifier. Owning the domain and using it for package naming is a good enough convention and helps avoid conflicting identifiers.
Java package naming convention http://en.wikipedia.org/wiki/Java_package#Package_naming_con...
Useful Stackoverflow discussion http://stackoverflow.com/questions/6273892/android-package-n...
If you don't own any domain, get one, it will help you tons and you can recoup the cost by passing on a cup of coffee every other sunday morning.